2 Jan
2017
2 Jan
'17
10:48 a.m.
From: Pete Lancashire
To convert from Muncell to RGB
Interesting. For one colour (D.C. Blue), listed on Charles' page as Munsell
5PB 3/10, that page gives it as 'outside sRGB gamut', whereas the page you
list gives it as sRGB [0,72,145].
Noel
2 Jan
2 Jan
11:53 a.m.
Here is a site that you can give it RGB and it will give the closest Pantone
http://rgb.to/0,72,145
On Mon, Jan 2, 2017 at 7:48 AM, Noel Chiappa <jnc at mercury.lcs.mit.edu> wrote:
From: Pete
Lancashire
To convert from Muncell to RGB
Interesting. For one colour (D.C. Blue), listed on Charles' page as Munsell
5PB 3/10, that page gives it as 'outside sRGB gamut', whereas the page you
list gives it as sRGB [0,72,145].
Noel
2:38 p.m.
On Jan 2, 2017, at 11:53 AM, Pete Lancashire <pete
at petelancashire.com> wrote:
Here is a site that you can give it RGB and it will give the closest Pantone
http://rgb.to/0,72,145
Then again, there are plenty of Pantone colors that have no RGB equivalent...
paul
2:57 p.m.
Then again, there are plenty of Pantone colors that
have no RGB equivalent...
For printing banner panels, would CMYK be a better fit than sRGB?
Are there no records of what DEC specified to their sub-contractors?
I learned the basics half a century ago, with "Color As Seen And
Photographed", "Kodak Color Dataguide", and "Kodak Color Darkroom
Dataguide", and then taught myself how to do color darkroom work.
Now, I suddenly realize that I am a half century out of touch with the
technology! I find this fascinating, and see an enormous amount of fun
trying to catch up!
3:09 p.m.
On Jan 2, 2017, at 2:57 PM, Fred Cisin <cisin at
xenosoft.com> wrote:
Basic printing is done with CMYK. But there are complications: it matters what the paper
(or other substrate) is that you're printing on. For example, CMYK printed on
newsprint has a smaller gamut than CMYK printed on coated paper (as used in magazines).
Printing of labels and the like often is done with "spot colors" -- either
instead of, or in addition to, the 4 basic "process colors" of CMYK. If you
look at product packaging cartons, you'll often see color marks on a hidden spot, say
the bottom flaps of the box, and often more than four colors are shown. The excess would
be spot colors. For example, a package of chocolate ice cream I just opened has a
chocolate brown spot color on it to make that part of the image really stand out.
Some high end ink jet printers (Epson comes to mind) have more than 4 colors for a wider
gamut and more accurate color rendering. They may also have gray inks for increased
grayscale range.
Company logos are often Pantone colors, and may be printed in spot color on business cards
and the like for better appearance. Or they may be out of CMYK gamut and need spot color
for that reason.
Even more esoteric is when a company has a custom color made up, not found in the Pantone
book. The company I work now did that a few years ago for their logo.
In all these cases, CMYK and RGB approximations can be had, but those may not be all that
close.
paul
Then again, there are plenty of Pantone colors
that have no RGB equivalent...
For printing banner panels, would CMYK be a better fit than sRGB?
Are there no records of what DEC specified to their sub-contractors? 
3:12 p.m.
On Mon, Jan 2, 2017 at 2:57 PM, Fred Cisin <cisin at xenosoft.com> wrote:
My motivation was for no other reason than to see what the colors
looked like on a web page.
The page shows what DEC used and that was Munsell and/or Ostwald
notation along with one Pantone and a couple paint manufacturers and
colors. That is all documented in DEC Std092. There are many other
color part numbers documented there, but most are references to OEM
customer colors.
Then again,
there are plenty of Pantone colors that have no RGB
equivalent...
For printing banner panels, would CMYK be a better fit than sRGB?
Are there no records of what DEC specified to their sub-contractors?
4:23 p.m.
On Mon, 2 Jan 2017, Charles Dickman wrote:
My motivation was for no other reason than to see what
the colors
looked like on a web page.
The page shows what DEC used and that was Munsell and/or Ostwald
notation along with one Pantone and a couple paint manufacturers and
colors. That is all documented in DEC Std092. There are many other
color part numbers documented there, but most are references to OEM
customer colors.
Thank you!
That explains the discussion, and makes perfect sense.
I finally got around to looking at your page. It is superb!
(And, The Red Car is a glorious memory of wonderful times)
It is especially amazing that the red pigment has held up so well!
--
Grumpy Ol' Fred cisin at xenosoft.com
2:29 p.m.
On Mon, Jan 2, 2017 at 10:48 AM, Noel Chiappa <jnc at mercury.lcs.mit.edu> wrote:
Any translation to sRGB with a 0 or 255, is potentially suspect.
From: Pete
Lancashire
To convert from Muncell to RGB
Interesting. For one colour (D.C. Blue), listed on Charles' page as Munsell
5PB 3/10, that page gives it as 'outside sRGB gamut', whereas the page you
list gives it as sRGB [0,72,145].
2763
days inactive
2763
days old
7 comments
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participants (5)
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chd＠chdickman.com -
cisin＠xenosoft.com -
jnc＠mercury.lcs.mit.edu -
paulkoning＠comcast.net -
pete＠petelancashire.com